CPI Investigation Procedures & Methods 2 — Questions and Answers
Question 1: When documenting a scene during a fire origin investigation, which photographic sequence is considered best practice?
- Wide-angle overview first, then mid-range, then close-up detail (Correct answer)
- Close-up detail first, then mid-range, then wide-angle overview
- Mid-range only, to save time
- Random order based on investigator preference
Correct answer: Wide-angle overview first, then mid-range, then close-up detail
The standard photographic sequence moves from general to specific — overview, mid-range, then close-up — to establish context before capturing detail.
Question 2: A CPI inspector arrives at a loss scene and finds that contractors have already begun demolition. What is the MOST important immediate action?
- Order all work to stop and document current conditions (Correct answer)
- Allow work to continue and interview workers later
- Leave and return when demolition is complete
- Submit a report without inspecting the scene
Correct answer: Order all work to stop and document current conditions
Stopping further alteration and documenting existing conditions preserves remaining evidence and establishes the scene's state at the time of inspection.
Question 3: Which method is used to determine the direction of heat travel in a structural fire investigation?
- Analyzing char depth patterns and burn indicators on structural members (Correct answer)
- Interviewing only the first arriving firefighter
- Reviewing the building's construction permits
- Measuring ambient temperature at the perimeter
Correct answer: Analyzing char depth patterns and burn indicators on structural members
Char depth and burn indicators on structural members reveal the path and direction heat traveled through a space.
Question 4: During an electrical fire investigation, an inspector discovers arc mapping evidence. What does arc mapping primarily help establish?
- The sequence of circuit failures and the area of fire origin (Correct answer)
- The amperage rating of the circuit breaker
- Whether the wiring met code at time of installation
- The total cost of electrical repairs needed
Correct answer: The sequence of circuit failures and the area of fire origin
Arc mapping tracks the locations of arc faults to reconstruct the sequence of electrical failures and identify where the fire started or traveled.
Question 5: What is the primary purpose of establishing a 'fire scene perimeter' during an investigation?
- To control access and protect physical evidence from contamination or loss (Correct answer)
- To estimate the total acreage of damage
- To determine insurance policy limits
- To identify neighboring property owners
Correct answer: To control access and protect physical evidence from contamination or loss
A controlled perimeter limits who enters the scene, preventing evidence contamination, loss, or alteration by unauthorized personnel.
Question 6: An inspector is examining a vehicle fire and notices the most severe burn damage is concentrated at the front engine compartment. What investigative step should follow?
- Systematically examine the engine compartment for potential ignition sources and fuel contacts (Correct answer)
- Conclude the fire was accidental and close the investigation
- Focus examination entirely on the passenger compartment
- Check only the fuel tank for leaks
Correct answer: Systematically examine the engine compartment for potential ignition sources and fuel contacts
The area of most severe damage is the starting point for identifying potential ignition sources and fuel sources within that zone.
Question 7: When collecting debris samples for laboratory analysis in an arson investigation, what type of container is preferred?
- New, clean metal paint cans with tight-fitting lids (Correct answer)
- Plastic zip-lock bags
- Paper grocery bags
- Cardboard boxes lined with newspaper
Correct answer: New, clean metal paint cans with tight-fitting lids
Clean, new metal paint cans are the standard container for fire debris because they prevent evaporation of accelerant vapors and are inert.
CPI Investigation Procedures & Methods 2
When documenting a scene during a fire origin investigation, which photographic sequence is considered best practice?